Please note that it can only charge small devices like a rechargeable speakers it won't charge a phone
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Step 1: Gathering Materials
You will need 4 rechargeable aa batteries USB socket I got mine from a car adapter Wires Tape do not use soldering iron Something to test the power I have a led powered by 1 v I got it from the circuit board inside a steak light
Step 2: Wiring It Together
Take the four batteries and put the in series by positive to negitive the tape it together again positive to negitive the do the same with the other two
Step 3: Attaching the USB Socket
By turning the white Side down look at the first terminal that is positive then the last one is negative so solder the wires to it
Step 4: Attaching Charging Wires
Attach two more wires to the terminals of the usb socket attach it to the battery wires I also added glue so nothing shorts out It can also be used as testing wires
Step 5: Charging
Charging is easy It is just 5v I am using a USB cable if the USB charger looks like that then outside is - and inside is + so it looks like this I just forgot to do the outside